Removed imported symbols that are not accessed or re-exported (#4387)

Co-authored-by: Eric Traut <erictr@microsoft.com>

stdlib/3/http/server.pyi

@@ -3,7 +3,7 @@
 import email.message
 import socketserver
 import sys
-from typing import Any, BinaryIO, Callable, ClassVar, Dict, List, Mapping, Optional, Sequence, Tuple, Union
+from typing import Any, Callable, ClassVar, Dict, List, Mapping, Optional, Sequence, Tuple, Union
 
 if sys.version_info >= (3, 7):
     from builtins import _PathLike